Thiazide-like diuretic
Chlorthalidone drug interactions: a practical overview
Drug interactions are the single biggest cause of preventable medication problems. Chlorthalidone (Chlorthalidone) interacts to varying degrees with several classes of medication and with a smaller list of foods. This page summarises the practically important ones at 15mg, 25mg, 50mg, framed for a real-world prescription review rather than an exhaustive PDF list.
High-priority interactions for Chlorthalidone
For Chlorthalidone, the most clinically relevant interactions are typically with strong CYP3A4 inhibitors and inducers, with cardiovascular medications (notably nitrates for several Thiazide-like diuretic agents), with central nervous system depressants, and with medications affecting blood pressure or heart rate. Chlorthalidone blocks the sodium-chloride symporter in the distal convoluted tubule of the kidney, reducing sodium reabsorption and producing modest diuresis.
Working with the pharmacist
A pharmacist review of all current medications is the practical safeguard against unintended interactions with Chlorthalidone. According to the prescribing information for Chlorthalidone, the full medication list — prescription, OTC, supplements and recreational substances — should be reviewed before starting and at every dose change at 15mg, 25mg, 50mg.
Frequently asked questions
What's the most important Chlorthalidone interaction to know? ▾
For most Thiazide-like diuretic medications, the highest-priority interaction is with nitrate medications used for chest pain — this combination is often a hard contraindication. After that, strong CYP3A4 inhibitors (some antifungals, macrolides) are the next concern at routine 15mg, 25mg, 50mg doses.
Do I need to tell the pharmacist about supplements? ▾
Yes. Supplements and herbal products can interact with Chlorthalidone in ways that prescription drug-drug interaction databases miss. The pharmacist needs the complete picture — including supplements like St John's Wort, grapefruit-containing products and high-dose vitamins — to flag risks at 15mg, 25mg, 50mg.
Products containing Chlorthalidone
More on Chlorthalidone
- With alcoholChlorthalidone and alcohol — is it safe to drink?
- With foodShould Chlorthalidone be taken with food?
- Side effectsChlorthalidone side effects: common, rare and warning signs
- Dosage guideChlorthalidone dosage guide: how much to take and when
- OnsetHow fast does Chlorthalidone start working?
- DurationHow long does Chlorthalidone last?
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.